水玻璃碱浓度和模数对碱矿渣胶凝材料孔隙液化学组成影响试验研究
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摘要
利用固液萃取法提取碱矿渣胶凝材料孔隙液,对孔隙液碱度和各离子浓度进行表征,并与硅酸盐水泥进行对比。同时研究了水玻璃碱浓度与模数对碱矿渣胶凝材料孔隙液化学组成的影响。结果表明:碱矿渣胶凝材料孔隙液的pH值较硅酸盐水泥低;孔隙液中的离子以钠为主。碱矿渣胶凝材料孔隙液中钠、硅、硫离子浓度随着水玻璃碱浓度的增加而增加;钙、镁、铝离子浓度则随着水玻璃碱浓度的增加基本呈下降趋势。碱矿渣胶凝材料孔隙液中钠离子和钾离子浓度随着模数的提高先上升后下降,在模数为1.5时达到最大,而钙、镁、铝离子浓度则在水玻璃模数为1.5时达到最低,水玻璃模数对孔隙液中硅、硫离子浓度没有显著的影响。随着水玻璃碱浓度的升高,碱矿渣胶凝材料孔隙液pH值呈上升趋势;随着水玻璃模数的增大,碱矿渣胶凝材料孔隙液pH值基本呈现出先增大后减小的趋势,pH值在水玻璃模数为1.5时达到最大值。
Pore solution of alkali activated slag was extracted by means of solid-liquid extraction,alkalinity and ionic concentration of the pore solution were characterized and the results were compared to Portland cement reference. Influence of alkali concentration and modulus of water glass on the chemistry of pore solution in alkali activated slag was also studied. The results show that the pH value of the pore solution of alkali activated slag is lower than that of Portland cement,and sodium is the main ion in the pore solution. The concentrations of sodium,silicon and sulfur ions in the pore solution of alkali activated slag increase with the increase of alkali concentration of water glass; while a downward trend is observed for the concentrations of calcium,magnesium and aluminum ions. The concentrations of sodium and potassium ions in the pore solution of alkali activated slag rise first and then decrease with the increase of modulus,and reach to the maximum values at modulus of 1. 5. While the concentrations of calcium,magnesium and aluminum ions reach to the lowest values when modulus is 1. 5. Modulus of water glass has no significant influence on the concentrations of silicon and sulphur ions in the pore solution. With the increase of the concentration of water glass,pH value of the pore solution of alkali activated slag increases.With the increase of modulus of water glass,pH value of the pore solution of alkali activated slag increases first and then decreases,and the pH value reaches to the maximum value when the modulus is 1. 5.
Pore solution of alkali activated slag was extracted by means of solid-liquid extraction,alkalinity and ionic concentration of the pore solution were characterized and the results were compared to Portland cement reference. Influence of alkali concentration and modulus of water glass on the chemistry of pore solution in alkali activated slag was also studied. The results show that the pH value of the pore solution of alkali activated slag is lower than that of Portland cement,and sodium is the main ion in the pore solution. The concentrations of sodium,silicon and sulfur ions in the pore solution of alkali activated slag increase with the increase of alkali concentration of water glass; while a downward trend is observed for the concentrations of calcium,magnesium and aluminum ions. The concentrations of sodium and potassium ions in the pore solution of alkali activated slag rise first and then decrease with the increase of modulus,and reach to the maximum values at modulus of 1. 5. While the concentrations of calcium,magnesium and aluminum ions reach to the lowest values when modulus is 1. 5. Modulus of water glass has no significant influence on the concentrations of silicon and sulphur ions in the pore solution. With the increase of the concentration of water glass,pH value of the pore solution of alkali activated slag increases.With the increase of modulus of water glass,pH value of the pore solution of alkali activated slag increases first and then decreases,and the pH value reaches to the maximum value when the modulus is 1. 5.
引文
[1]陈伟,Brouwers,水中和.水泥浆体液相离子浓度模拟[J].武汉理工大学学报,2010(11):1-5.
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[12]马倩敏,黄丽萍,牛治亮.碱激发剂浓度及模数对碱矿渣胶凝材料抗压性能及水化产物的影响研究[J].硅酸盐通报,2018,37(6):2002-2007.
[13]Page C L.Mechanism of corrosion protection in reinforced concrete marine structures[J].Nature,1975,258(5535):514-515.
[14]何娟,何廷树,杨长辉,等.碳化对碱矿渣水泥石干燥收缩的影响[J].建筑材料学报,2015,18(2):221-227.
[15]Ravikumar D,Neithalath N.Effects of activator characteristics on the reaction product formation in slag binders activated using alkali silicate powder and Na OH[J].Cement&Concrete Composites,2012,34(7):809-818.
[16]李响,阎培渝.粉煤灰掺量对水泥孔溶液碱度与微观结构的影响[J].建筑材料学报,2010,13(6):787-791.
[17]Bernal S A,Provis J L,Rose V,et al.Evolution of binder structure in sodium silicate-activated slag-metakaolin blends[J].Cement&Concrete Composites,2011,33(1):46-54.
[18]Hong S Y,Glasser F P.Alkali sorption by C-S-H and C-A-S-H gels:partⅡrole of alumina[J].Cement&Concrete Research,2002,32(7):1101-1111.
[19]Rashad A M,Zeedan S R,Hassan A A.Influence of the activator concentration of sodium silicate on the thermal properties of alkali-activated slag pastes[J].Construction&Building Materials,2016,102(2):811-820.
[20]Neto A A M,Cincotto M A,Repette W.Drying and autogenous shrinkage of pastes and mortars with activated slag cement[J].Cement&Concrete Research,2008,38(4):565-574.
[21]Chen W,Brouwers H J H.A method for predicting the alkali concentrations in pore solution of hydrated slag cement paste[J].Journal of Materials Science,2011,46(10):3622-3631.
[22]赵三银,余其俊,乔飞,等.碱激发碳酸盐矿-矿渣复合作用及机理的研究[J].武汉理工大学学报,2007,29(12):15-19.
[23]Shi Z,Shi C,Wan S,et al.Effect of alkali dosage on alkali-silica reaction in sodium hydroxide activated slag mortars[J].Construction&Building Materials,2017,143:16-23.
[2]施惠生,郭晓潞,阚黎黎.水泥基材料科学[M].北京:中国建材工业出版社,2011.
[3]Lothenbach B,Winnefeld F.Thermodynamic modelling of the hydration of Portland cement[J].Cement&Concrete Research,2006,36(2):209-226.
[4]Gruskovnjak A,Lothenbach B,Holzer L,et al.Hydration of alkali-activated slag:comparison with ordinary Portland cement[J].Advances in Cement Research,2006,18(3):119-128.
[5]Andersson K,Allard B,Bengtsson M,et al.Chemical composition of cement pore solutions[J].Cement&Concrete Research,1989,19(3):327-332.
[6]Panchmatia P,Olek J,Kim T.The influence of air cooled blast furnace slag(ACBFS)aggregate on the concentration of sulfates in concrete’s pore solution[J].Construction&Building Materials,2018,168:394-403.
[7]Puertas F,Fernández-Jiménez A,Blanco-Varela M T.Pore solution in alkali-activated slag cement pastes.Relation to the composition and structure of calcium silicate hydrate[J].Cement&Concrete Research,2004,34(1):139-148.
[8]刘小金.用交流阻抗方法研究碱激发矿渣水泥浆体水化和微观结构[D].长沙:湖南大学,2015.
[9]Puertas F,Torres-Carrasco M.Use of glass waste as an activator in the preparation of alkali-activated slag.Mechanical strength and paste characterisation[J].Cement&Concrete Research,2014,57(3):95-104.
[10]何娟,杨长辉.水玻璃激发碱-矿渣水泥的水化放热和凝结性能[J].土木建筑与环境工程,2011,33(3):147-152.
[11]Krizan D,Zivanovic B.Effects of dosage and modulus of water glass on early hydration of alkali-slag cements[J].Cement&Concrete Research,2002,32(8):1181-1188.
[12]马倩敏,黄丽萍,牛治亮.碱激发剂浓度及模数对碱矿渣胶凝材料抗压性能及水化产物的影响研究[J].硅酸盐通报,2018,37(6):2002-2007.
[13]Page C L.Mechanism of corrosion protection in reinforced concrete marine structures[J].Nature,1975,258(5535):514-515.
[14]何娟,何廷树,杨长辉,等.碳化对碱矿渣水泥石干燥收缩的影响[J].建筑材料学报,2015,18(2):221-227.
[15]Ravikumar D,Neithalath N.Effects of activator characteristics on the reaction product formation in slag binders activated using alkali silicate powder and Na OH[J].Cement&Concrete Composites,2012,34(7):809-818.
[16]李响,阎培渝.粉煤灰掺量对水泥孔溶液碱度与微观结构的影响[J].建筑材料学报,2010,13(6):787-791.
[17]Bernal S A,Provis J L,Rose V,et al.Evolution of binder structure in sodium silicate-activated slag-metakaolin blends[J].Cement&Concrete Composites,2011,33(1):46-54.
[18]Hong S Y,Glasser F P.Alkali sorption by C-S-H and C-A-S-H gels:partⅡrole of alumina[J].Cement&Concrete Research,2002,32(7):1101-1111.
[19]Rashad A M,Zeedan S R,Hassan A A.Influence of the activator concentration of sodium silicate on the thermal properties of alkali-activated slag pastes[J].Construction&Building Materials,2016,102(2):811-820.
[20]Neto A A M,Cincotto M A,Repette W.Drying and autogenous shrinkage of pastes and mortars with activated slag cement[J].Cement&Concrete Research,2008,38(4):565-574.
[21]Chen W,Brouwers H J H.A method for predicting the alkali concentrations in pore solution of hydrated slag cement paste[J].Journal of Materials Science,2011,46(10):3622-3631.
[22]赵三银,余其俊,乔飞,等.碱激发碳酸盐矿-矿渣复合作用及机理的研究[J].武汉理工大学学报,2007,29(12):15-19.
[23]Shi Z,Shi C,Wan S,et al.Effect of alkali dosage on alkali-silica reaction in sodium hydroxide activated slag mortars[J].Construction&Building Materials,2017,143:16-23.